I’m looking for some instrument related tables in the database dump (I_instrument_recording or I_instrument_release for example) but I can’t find them in the PostgreSQL Data Dumps. What’s going wrong?
I think these tables are empty as there are no current relationships that directly link instruments to releases or recordings.
There are performance relationships between recording / release and artists, and those can specify instruments.
To complete the previous answer, see Relationship Types - MusicBrainz to find out which ones exist or not.